Bridging,Provider Bridging,Provider Backbone and Shortest Path Bridging
I received an interesting comment to my last post on networkcomputing It was about Avaya’s SPB and how it served in the core of the network at the Sochi Olympics. For those who are not familiar with acronym, SPB stands for Shortest Path Bridging and it is used for large scale bridging in the data… Read More »
The post Bridging,Provider Bridging,Provider Backbone and Shortest Path Bridging appeared first on Network Design and Architecture.
IPv6 — Still No Love?
When IPv6 becomes a business problem, and not a technical one, it will start seeing serious adoption in the enterprise. A lack of available IPv4 addresses and expensive aftermarket pricing might start driving North America towards broad IPv6 adoption. Finally.PSA: Linux Does RPF Checking
Twice now I've "discovered" that Linux hosts (even those that aren't doing IP forwarding) do Reverse Path Forwarding checks on incoming traffic.Both times this has come up was in the context of a multicast application. It resulted in a conversation that went like this:
Application Person: Hey Chris, what's up with the network? My application isn't receiving any traffic.In the end, it turns out that the network was operating perfectly fine. The requested traffic was being delivered to the server, on the interface that requested it. It was the routing table within the Linux host that was screwed up.
Me: Um... The routers indicate they're sending it to you. The L3 forwarding counters are clicking. The L2 gear indicates it has un-filtered all of the ports between the router and your access port. Are you sure?
Application Person: My application says it's not arriving.
Me: I now have tcpdump running on your server. The traffic is arriving. Here are the packets. Do they look okay?
RPF Checks
Reverse Path Flow checking is a feature that checks to make sure that a packet's ingress interface is the one that would be used to reach the packet's source. If a Continue reading
The Two “Network As Code” Domains
You’ve probably heard the term “network programmability” at this point. You probably also heard it equated to anything to do with code, automation, and networking. This was not always the case.
Network programmability really first hit the big time back in 2011 in the early days of the public OpenFlow discussion. That phrase was almost universally understood to be a data plane concept - because it was describing the revolutionary ideas brought up by abstracting away a forwarding pipeline. “You mean I can program my network device directly?” Network programmability.
I was inspired by a thread that my friend Josh kicked off with this tweet:
I am far from being a dev but I am no longer scared to learn to code. Thanks to the folks helping me start to get it.
— joshobrien77 (@joshobrien77) April 23, 2015An interesting dialogue followed, and I felt compelled to address the problem caused by marketing departments muddying the waters of what would otherwise be a very simple idea.
Now obviously it’s too late to “right the wrong” that resulted from marketing and journalism engines chugging at full steam trying to make every technical term and phrase utterly useless. However, I would like Continue reading
The Two “Network As Code” Domains
You’ve probably heard the term “network programmability” at this point. You probably also heard it equated to anything to do with code, automation, and networking. This was not always the case.
Network programmability really first hit the big time back in 2011 in the early days of the public OpenFlow discussion. That phrase was almost universally understood to be a data plane concept – because it was describing the revolutionary ideas brought up by abstracting away a forwarding pipeline. “You mean I can program my network device directly?” Network programmability.
I was inspired by a thread that my friend Josh kicked off with this tweet:
I am far from being a dev but I am no longer scared to learn to code. Thanks to the folks helping me start to get it.
— joshobrien77 (@joshobrien77) April 23, 2015
An interesting dialogue followed, and I felt compelled to address the problem caused by marketing departments muddying the waters of what would otherwise be a very simple idea.
Now obviously it’s too late to “right the wrong” that resulted from marketing and journalism engines chugging at full steam trying Continue reading
SD-WAN with Viptela
Software Defined Wide Area Networking (SD-WAN) is bubbling up to be one of the prime use cases of SDN. The vendors that fall into the SD-WAN bucket often include Glue Networks, Nuage, Viptela, CloudGenix, VeloCloud, etc. As you dive into each of the solutions from the vendors, you may realize that some are truly unique technologically and some may just be offering a better way to manage existing wide area networking equipment (which is still a huge value add).
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Show 235 – HP IMC BYOD Solution – Sponsored
HP Networking's Juliano Forti & Chris Young talk with Greg Ferro and Ethan Banks about how HP handles BYOD through integration with HP's Intelligent Management Center platform.
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The post Show 235 – HP IMC BYOD Solution – Sponsored appeared first on Packet Pushers Podcast and was written by Ethan Banks.
A framework for BackupPC‘s pre/post scripts
Use the same framework for all hosts, and run per-host scripts where needed.Configuration management 101
Configuration management, without a doubt this is probably one of those things we all do, but to what end do we perform configuration management though? Usually configuration begins and sometimes ends with backing up and storing those configuration files but how much further can or should we go with configuration? Backing and storing configuration files […]